1. Endotracheal Tube Cuff
Pressure Indicator
Client: Dr. Lester Proctor
Advisor: Kristyn S. Masters
Team V-Tec
Michael Alexander - Team Leader
Claire Edlebeck - BWIG
Samantha Bergh - Communications
Tyler Lark - BSAC
Lucas Vitzthum - Graphics

2. Outline Problem Statement Background Existing Devices
Design Constraints
Design Ideas
Design Matrix
Future Work

3. Problem Statement Endotracheal Tubes Use in pediatrics Cuff Pressure
Optimal Pressure Range
Use in pediatrics

4. Background Information
20,000 Operations Annually
25% Children
75% Require Endotracheal Tube
Inflatable Cuff for Adults
Advantages
Tight Seal
Prevents Aspiration
Disadvantages
Ischemia due to excess pressure
Risk Increased in Children

5. Current Devices Patents On the Market Several
None marketed
Not similar to our designs
On the Market
Hi-Lo® Tracheal Tube with Lanz® Pressure- Regulating Valve

6. Design Constraints Pressure-Regulation Performance level Disposability
MRI/CT Compatibility

7. Electrical Design Solution
Uses electrical pressure transducer
Measures pressure inside cuff
Translates different pressures into distinct voltages
Voltage powers the corresponding LEDs
Source: omega.com, Tim Shedd

8. Electrical Design (cont.)
Pros
Highly Accurate, Precise
Visually exact
Cons
Expensive ($85.00/unit)
May interfere with medical equipment
Not MRI compatible
Highly accurate—0.3 psi range
Visually precise—different colored LEDs eliminate mistakes in reading the pressure, thus creating a more reliable method of displaying the pressure to the physician
CONS
Expensive $85.00 per unit

9. Mechanical Design Pressure gauge attached near pilot balloon
Pressure acts on piston inside device
Piston increasingly protrudes indicating pressure

10. Mechanical Design (cont.)
Pros
Economic
Versatile
Cons
Difficult to calibrate
Requires MRI compatible form of resistance
Reads multiple Pressures,,, more versitile
cons
can’t use spring

11. Design 3: Relief Valve
Additional valve and tube attached to pilot balloon
Standard pressure relief valve
Predictably fails at 25 cm H2O pressure
Clamp allows for override

12. Relief Valve: Pros & Cons
Reliably releases pressure
Safe
Relatively inexpensive to manufacture
Cons
MRI Interference
Precision manufacturing required
No longer embodies our clients preference

13. Design Matrix Safety(10) Client Preference (10) Ease of Use (5)
Effective-ness (5)
Price (10)
Total (40)
Electrical 9 1 5 4 20
Mechanical 8 10 36
Relief Valve 6 3 7 31

14. Future Work DESIGN TESTING CREATE PROTOTYPE
Specify dimensions of prototype
MRI compatibility
Discuss with client
Obtain necessary skills in machine shop
Investigate means of fabrication
Molding
Machining
Rapid Prototyping
Accuracy of Pressure Reading
Constant Rate of Pressure Release
Repeatability and Reproducibility
Labview

15. Any Questions?